Last month when I climbed Kilimanjaro, fitnesswise I felt a little unprepared, I did a little walking and swimming beforehand but no other training except my daily 20 minute morning yoga. Surprisingly, I felt really fit and strong, as fit as I had when I climbed the Dolomites 15 years ago. I also did a particular type of yoga breathing to help combat altitude sickness which really helped and calmed it down.